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In Testosterone Testing, Time of Day Matters

the MPR take:

Previous research has pointed to the hours between 8am and 11am as the optimal time of day to draw total testosterone in men with erectile dysfunction, but a new study suggests that this time should vary by age of patient. In a retrospective analysis of 2,569 patient charts of men presented with erectile dysfunction for total testosterone and draw times, men were compared by age group and variability of total testosterone. Mean total testosterone was found to differ clinically and statistically at 7am to 9 am and 9am to 2pm, but only in men <40 years of age vs. ages 40–44. For men >45 years of age, no clinically and statistically significant difference was seen in the results. The authors recommend that total testosterone in men with erectile dysfunction who are <45 years should be drawn as close to 7 a.m. as possible, but men >45 years can have total testosterone drawn at any time before 2pm.

In Testosterone Testing, Time of Day Matters

Doctors often recommend that men with erectile dysfunction have their testosterone measured from 8 a.m. to 11 a.m., because levels are usually highest then and vary over a 24-hour period. Researchers retrospectively studied records of 2,569 men ages 26 to 84 who were evaluated at an erectile dysfunction clinic from 1985 to 2004. They sorted them into age groups, starting with 26- to 39-year-olds, and then in five-year groups up to age 84.